稀土Ce和Y在ZK60合金中的分布、演变及其对性能的影响

Distributing, Evolvement and Effect on the Mechanical Properties of the Rare-Earth Ce, Y in ZK60 Alloys

用熔铸法制备了两类8种镁-稀土合金,通过力学性能试验,X射线衍射(XRD)、扫描电子显微(SEM)分析确定了稀土元素Ce、Y在ZK60镁合金中的分布、演化规律及其不同状态时所发挥的作用。结果表明:ZK60-1.5Ce和ZK60-1.0Y分别在两类合金中具有最佳的力学性能;Ce和Y在铸态时都分布在晶界上,在基体镁中的分布极少,经挤压变形后,Ce和Y沿挤压方向分布;无论合金处于什么状态,Ce和Y都以化合物的形式存在为主。试验合金的力学性能都高于ZK60合金本身。

Eight kinds of Mg-RE alloys were prepared. The distribution, evolvement and actions of RE Ce and Y in the investigated alloys were measured by mechanical properties examination, X-rays diffraction and SEM. The result shows that the ZK60-1.5Ce and ZK60-1.0Y alloys possess the optimal mechanical properties in these investigated alloys. The RE Ce and Y distribute on the crystal boundary at casting After extrusion and T5 （150 ℃ for 0-24 h） heat-treatment, the RE Ce and Y distribute along extrusion direction, mainly in the compound form whatever the alloy exists in any state. The mechanical properties of the investigated alloys are more excellent than that of ZK60 .